Knife



FIG. 1 is a front view of a knife according to the present design;

FIG. 2 is a back view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a second side view thereof;

FIG. 5 is a first end view thereof; and,

FIG. 6 is a second end view thereof. 

The ornamental design for a knife, as shown and described. 